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OFDMA vs SCFDMA

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EngMichel
OFDMA vs SCFDMA

Hello everybody...
please can I ask why ,in 4g LTE systems, beside of our using of scfdma as an uplink modulation technique, why we don't use it also for the downlink direction.. why we use ofdma in the downlink though scfdma is more power efficient than ofdma and carry almost the same other characteristics...

can anyone tells me what are the reasons behind that..."with a deep explanation plzz" !?!